| 吐哈盆地煤岩饱和烃络合后生标碳同位素分布特征 |
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| 引用本文： | 杜丽,孟仟祥,李玉梅,李立武,李中平.吐哈盆地煤岩饱和烃络合后生标碳同位素分布特征[J].甘肃科学学报,2008,20(4). |
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| 作者姓名： | 杜丽 孟仟祥 李玉梅 李立武 李中平 |
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| 作者单位： | 中国科学院,地质与地球物理研究所气体地球化学重点实验室,甘肃,兰州,730000 |
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| 基金项目： | 国家自然科学基金，国家重点实验室基金 |
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| 摘 要： | 利用GC-IRMS技术结合5分子筛络合方法,对吐哈盆地煤岩系列生标化合物进行单体烃碳同位素测定,根据碳同位素分布和组成,研究沉积环境和母质输入特征,探讨了生物地球化学意义.研究表明,吐哈盆地煤岩样品的母质类型是以高等植物为主要母质输入,演化程度较低(RO%=0.47,OPE2=1.48和C29ααα-甾烷20S/20(S+R)=0.12)的淡水弱氧化环境(沼泽).使用5分子筛络合能选择性地富集藿烷类化合物,使其满足GC-IRMS的测定要求.另外,单体烃碳同位素分布特征显示:在相同沉积环境、相似母质来源的沉积有机质中碳同位素在萜烷与链烷烃之间存在着较明显的同位素分馏效应,即藿烷(五环三萜烷)比链烷烃(包括正构烷烃及类异戊二烯烷烃)更富集轻的碳同位素.
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| 关 键 词： | GC-IRMS 藿烷类化合物 5分子筛 吐哈盆地煤岩 |
Distribution Characteristics of Carbon Isotopic for Biomarkers from the n-alkanes after Complex in Coal in Turpan-Hami Basin |
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| DU Li,MENG Qian-xiang,LI Yu-mei,LI Li-wu,LI ZHONG-ping.Distribution Characteristics of Carbon Isotopic for Biomarkers from the n-alkanes after Complex in Coal in Turpan-Hami Basin[J].Journal of Gansu Sciences,2008,20(4). |
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| Authors: | DU Li MENG Qian-xiang LI Yu-mei LI Li-wu LI ZHONG-ping |
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| Institution: | Key Laboratory of Gas Geochemistry;Institute of Geology and Geophysics;Chinese Academy of Sciences;Lanzhou 730000;China |
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| Abstract: | By using GC-IRMS(Gas Chromatography-Isotope Ratio Mass Spectrometer) technique combined with the 5 molecular sieve method,carbon isotopes of biomarkers in the coal from Turpan-Hami Basin were analyzed.Based on the characteristics of the carbon isotopic composition and distribution pattern,the sedimentary environment and the parent material input of the coal sample were studied,and the biogeochemical significance was also discussed.The results show that the 5 molecular sieve method can selectively enrich h... |
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| Keywords: | GC-IRMS |
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